ZIP code 94509

Contra Costa County, including Antioch and Pittsburg

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Report created October 27, 2026 at www.firezones.info/zip/94509

  • Fire hazard severity zones

    Share of the land in each CAL FIRE hazard class

    13% High · 2% Very High

    Most of the High land is in the State Responsibility Area, where the State Fire Marshal's zones apply.

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  • Fire history

    Share of the land inside a recorded wildfire perimeter

    4% has burned

    Most recently the 2025 Somersville Fire, which burned 227 acres here, one of 9 fires on record.

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  • Power line fire risk

    Share of the land in the High Fire-Threat District

    11% Elevated

    Utilities may shut off power in the CPUC High Fire-Threat District in fire weather, and homes outside it can lose power when their lines run through it.

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Land by hazard class

  1. Very High 184 acres · State Responsibility Area 2%
  2. High 1,473 acres · 950 state, 523 local 13%
  3. Moderate 442 acres · 24 state, 418 local 4%
  4. Non-wildland 8,383 acres · Local Responsibility Area 74%
  5. Not mapped by CAL FIRE 829 acres · Mostly federal land 7%

11,311 acres of land in all, 1,158 in the State Responsibility Area and 9,324 in the Local. State zones are the ones the State Fire Marshal designated, in effect since 1 April 2024. Local zones are CAL FIRE's 2025 recommendation, which each city or county adopts by ordinance and can make stricter. How to read fire zones

Fires that burned here

  1. 2025 Somersville Fire Of 358 acres in all · Cause: Campfire 227 acres
  2. 1997 Black Diamond Mi Fire Of 475 acres in all 124 acres
  3. 2005 Con Assist 11_dolan Fire Of 78 acres in all · Cause: Arson 77 acres
  4. 1967 Thomas Fire Of 231 acres in all 43 acres
  5. 1979 Black Diamond Peak Fire Of 681 acres in all 37 acres
  6. 2024 Sardis Fire 11 acres
  7. 2024 Sardis 2 Fire 5 acres
  8. 1970 Stwewartville #2 Fire Of 335 acres in all 3 acres
  9. 2024 Wilbur Fire 2 acres

In all, 460 acres of ZIP code 94509 have burned. Acres are the land each fire burned here, and fires that crossed less than an acre are not counted. Some older or smaller fires may be missing, and a fire perimeter can include unburned patches. How to read fire history

Sources

Fire hazard severity zones
CAL FIRE Office of the State Fire Marshal
State map published 27 June 2025, local map 2 February 2026
Fire history
CAL FIRE Fire and Resource Assessment Program
Published 28 July 2026
Power line fire risk
California Public Utilities Commission
Published 23 February 2026

This site is independent and not affiliated with CAL FIRE or the CPUC, so for an official determination, check with the agency or your city or county. How we read the data

Nearby areas

Communities in ZIP code 94509

Neighboring ZIP codes

  1. 94509 13% High · 2% Very High · this area
  2. 94531 5% Very High
  3. 94561 No hazard zones
  4. 94565 34% High · 1% Very High
  5. 94571 23% High · <1% Very High